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Motives for better Engineering

Coulomb's wedge theory
of earth pressure

Explore horizontal earth pressure,
Coulomb's theory, and its applications.
Compare geotechnical results and
understand the trial wedge method's nuances.

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Baltimore bridge collapse:
What structural engineers can do

Explore the technical content on vessel collision
to calculate the annual frequency of bridge component collapse.

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Seismic Isolation in Structural Design:
Concepts and Applications

Introducing the concept of seismic isolation design.

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Balancing Safety and Efficiency: Strategies for Bridge Load Posting

Yanling LengOct 20, 2023

Load Rating Bridge Finite Element Analysis Moving Load Analysis America Structure Type_Dam Field_Bridge Category_How-to Structure Type_Bridge Design Code_AASHTO

Bridge load posting – identifying just how much weight a bridge can bear – is a matter of public safety and a way to safeguard vital transportation infrastructure. However, load posting is less straightforward than it may seem. Not posting a bridge can create safety issues for the motoring public, while posting makes transportation more difficult for large, heavy vehicles and the industries that use them. 

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Composite Bridge Modeling Tips: A Comprehensive Guide

Zachary TaylorOct 20, 2023

Bridge Analysis Project Application Bridge Finite Element Analysis Boundary Conditions Construction Stage Analysis Torsion FEA America Field_Bridge Category_Knowledge Category_How-to Structure Type_Bridge Design Code_Eurocode

How to Model the Girder and Deck Connection in Composite Bridge?

 

The way to simulate the connection between the girder and the deck will depend on how we construct the model. In the 2D all-frame composite bridge model shown in Figure 1, all the elements are connected in the grid within the same plane. Because it was modeled with the "all frame" model type in the midas Civil composite bridge wizard, it only consists of a 2-D grid frame composed of beam elements. In this scenario, the software considers the composite section as a lump section that incorporates both the girder section and the deck section. This means that the composite action is transformed into equivalent section properties in midas Civil. 

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Understanding Convergence in Curved Girder Analysis

Bridge Analysis Bridge Finite Element Analysis FHWA Torsion FEA America Curved Girder Analysis Structure Type_Dam Field_Bridge Category_Knowledge Category_How-to Structure Type_Bridge

What is Convergence? What is a Convergence Study? 

 

It is easy to obtain the result from bridge finite element analysis, but to get more accurate results requires extra effort. Even the most robust finite element analysis solvers adopt the method that approximates the structural behavior, by minimizing the associated error function compared with the complex function that represents the realistic structural behavior. 

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Strut-and-Tie Modeling for Pier Caps: Geometries and Practices

Daniel BaxterOct 20, 2023

Bridge Finite Element Analysis Moving Load Analysis Strut-and-Tie Model Truss Model America Structure Type_Building Field_Bridge Category_Knowledge Category_How-to Structure Type_Bridge Design Code_AASHTO

What is Strut-and-Tie Analysis? What are "Struts" and "Ties" in Strut-and-Tie Analysis?

 

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Material Properties' Time Functions in Concrete Structures

Concrete Construction Stage Analysis Cantilever Bridge Nonlinear Analysis moment redistribution America Shrinkage Creep Coefficient Field_Bridge Category_Knowledge Category_How-to

In the blog article intro to Time-dependent Analysis for Concrete Structures, we have touched upon the importance of construction stage analysis for concrete structures. The material time function can be plotted and inputted into analysis software like midas Civil to simulate their changing material behavior in various stages of the construction. This article will go over the process of calculating various parameters that contribute to the shape and location of the material's time functions. 

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Exploring Watanabe's Efficient Influence Line Analysis

Bridge Design Influence Line America Watanabe Structure Type_Dam Field_Bridge Category_Knowledge Category_How-to Structure Type_Bridge

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Streamlined Shear Design for Steel Composite Girders

Project Application Bridge Bridge Engineering Bridge Construction America Structure Type_Dam Field_Bridge Category_Knowledge Category_How-to Structure Type_Bridge Design Code_AASHTO

Believe it or not, once upon a time, there were no computers available for us, bridge engineers. At that time, we had to perform every calculation by hand using calculators or even slide-rules. It was quite dull and time-consuming. Now all we have cutting-edge computers, which is way better than those we used when we landed at the Moon. Everything looks nice, and life seems beautiful, doesn't it?

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Exploring Trigonometric Methods in Suspension Bridge Analysis

Bridge Design Nonlinear Analysis America Structure Type_Dam Field_Bridge Category_Knowledge Structure Type_Bridge Design Code_ASCE

There are a couple of ways to analyze suspension bridges. As previously discussed (Uniqueness and Difficulties of Suspension Bridge Analysis), the deflection theory proposed by Melan and solved by Moisseiff is one of the first. The second one may be trigonometric methods proposed by Timoshenko (Theory of suspension bridges, Journal of the Franklin Institute, Volume 235, Issue 4, April 1943, Pages 327-349). In this article, a brief explanation of trigonometric methods and related excel, and the example bridge dimensions will be provided.

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Michael Baker's Approach to Complex Load Rating for Steel Bridges

Project Application Load Rating Bridge Steel Bridges America AASHTO Classification Structure Type_Building Field_Bridge Category_How-to Structure Type_Bridge Design Code_AASHTO

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Curved vs. Straight Beams: Impact on Bridge Design

Bridge Design Composite Steel Curved Bridges Structural Engineering America Structure Type_Dam Field_Bridge Category_Knowledge Category_How-to Structure Type_Bridge

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In-Depth Guide to Long-Term Creep Effects in Bridges

Finite Element Analysis Construction Stage Analysis America Structure Type_Dam Field_Bridge Category_Knowledge Category_How-to Structure Type_Bridge

Creep Analysis 6

 

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Analyzing Creep in Bridges: Advanced Modeling Insights

Finite Element Analysis Bridge Modeling Construction Stage Analysis America Structure Type_Dam Field_Bridge Category_Knowledge Category_How-to Structure Type_Bridge

Creep Analysis 7

 

Think about a two-span continuous bridge, as shown in Fig 1. Let's calculate the secondary creep moments. Detailed dimensions and creep factors, etc., are not important, and the MIDAS file "Creep 2ndary Check"is attached for the reader's reference.

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Advanced Creep Coefficient Analysis in Structural Design

Finite Element Analysis Construction Stage Analysis America Structure Type_Dam Field_Bridge Category_Knowledge Structure Type_Bridge

Creep Analysis 1 

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Mastering Unsymmetric Section Analysis in Bridge Design

Section Properties Structural Engineering America Unsymmetric Section Analysis Structure Type_Dam Field_Bridge Category_Knowledge Category_How-to Structure Type_Bridge

Unsymmetric Section Analysis

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Understanding Creep Analysis Through Flexibility Methods

Finite Element Analysis Construction Stage Analysis America Field_Bridge Category_Knowledge

Creep Analysis 3



The blog article of Creep Analysis 3 showed how Dr. Ghali et al. explained the creep analysis by flexibility methods.


To better understand the creep behavior, solve the previous example in a less efficient way. Here, different sign conventions will be applied.

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